Hermann a



No. 753,145. PATENTED FEB. 23, 1904.

. H. A. KLEMM. V TRIMMING CUTTER ATTACHMENT FOR ZIGZAG SEWINGMAOHINES.

APPLIOATION FILED MAY 13, 1903.

H0 MODEL.

R m 1 S q UHSMeooeo w y e UNITED STATES Patented February 23, 1904.

PATENT OFFICE.

HERMANN A. KLEMM, NEW YORK, N. Y.

TRlMNllNG-CUTTER .ATTACHMENT'FOR ZIGZAG-SEWING MACHINES- SPECIFICATIONforming part of Letters Patent No. 753,145, dated February23, 1904. i

6 Application filed May 13,1903. Serial na'lsaeio. (Nemodeh) Y To aZZwhom it may concern} Be it known that I, HERMANN A. KLEMM, a citizen ofthe United States of America, and a resident of the borough of Bronx,New York city, State of New York, have invented certain new and usefulImprovements in Trimming- Cutter Attachments for Zigzag-Sewing Machines,of which the following is a specification.

My invention consists of improvements in trimming-cutter attachments forzigzag-sewing machines of the character represented in the LettersPatent Nos. 686,662 and 710,696,-

granted to me November 12, 1901, and October 7, 1902, respectively, foruniting two pieces of work at the edges by zigzag stitches traversingthe meeting edges of the work placed flatwise on the work-plate, withthe edges to be united meeting each other in the median line of theseam, as Well as for making ornamental zigzag stitches on the surface ofintegral webs.

The essential feature of the invention now the plane of the median lineof the seam in suitable advance of the needles and two lateralbed-cutters in the work-plate constantly held by yielding pressure tooperative relation with the edges of the vertical cutter, respectively,with a gage-prong of said vertical cutter in rear of the cutting partsof the edges, preventing nearer approach of the bed-cutters toward eachother, while the cutting parts of the vertical cutter are open withrespect to the bedcutters for the advance of the Work, all ashereinafter described, reference being made to the accompanyingdrawings, in which Figure 1 is a front elevation of the essential partsof a zigzag-sewing machine with parts in vertical section and with apiece of work in section, showing the application of my invention. Fig.2 is a detail in vertical longitudinal section of the feed-dog, withsome parts in elevation.v Fig.3 is a detail in plan view with ahorizontal section of the vertical cutter. Figs. 4 and 5 are horizontalsections of the needlebars and plan views of needle-carrying arms,illustrative of the operations of the needles in producing the zigzagstitches. Fig. 6 is an elevation of needle-carrying arms and parts ofthe needle-bars detached for clearer illustration. Fig. 7 is a diagramof a piece of work with a horizontal section of l the vertical cutter,illustrative of the operation of the attachment.

In the drawings, a represents one needle carried by an arm at of aneedle-bar Z2, and c another needle carried in an arm (Z of anotherneedle-bar e, which needles are made to change places with each other atevery operation, as indicated to some extent in Figs. 4, 5, and 6 and asfully illustrated and described in the beforementioned Letters Patentgranted to me, but more particularly No. 710,696, for producingdouble-zigzag stitches, as f in Fig. 6, to which said Letters Patentreference is made for understanding of the details of apparatus foreffectin g such change. It may: however, be herein stated that Figs. 4and 5 show the exchanged positions. The dotted lines in Fig. tindicate aback position of needle-bar b and needle a, which represents the firstmovement of exchange by which the needle-bars are free to shiftlaterally without conflict with each other.

site sides of said cutter h, with a prong of the latter cutter extendingbetween the ends of cutters a little back of the operative parts of thecutters for a gage to limit the advance of cutters 11 at the proper timefor cutting, and with tension-springs Z3 to hold said cutters up to saidgage. The operator guides the pieces q to the cutters, with the edges ofthe pieces in close contact, as shown at o, so that both edges aretrimmed by the respective edges of cutter it, behind which the operatorpresses the pieces toward each other to close up the space Z left by thetrimming in advance I00 of the needles, so that the edges are joinedclosely.

The lateral cutters v are fitted in suitable ways m in the Work-plate,and the cutter-head 0, carrying the cutter h, is mounted on avertically-reciprocating bar p, mounted in guideways g, suitably placedon the head 7 of the stationary arm 8 of the machine. In this example Ihave represented a lever 25 pivoted at u to a bracket Z of saidstationary arm, said lever being linked at w to a disk w, suitablygeared within the hollow space of arm 8, with the main shaft y for beingrotated; but the means for operating cutter k may of course be varied atwill.

What I claim as my invention is- The combination with a pair ofzigzagstitch-forming needles and means for operating said needles, of apair of bed-cutters and HERMANN A. KLEMM.

Witnesses:

C. SEDGWICK, A. P. THAYER.

